office-gobmx/hwpfilter/source/hgzip.cpp

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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
* Copyright 2008 by Sun Microsystems, Inc.
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*
* OpenOffice.org - a multi-platform office productivity suite
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*
* $RCSfile: hgzip.cpp,v $
* $Revision: 1.4 $
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*
* This file is part of OpenOffice.org.
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*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
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*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
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*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
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*
************************************************************************/
#include "precompile.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include "hgzip.h"
#include "hstream.h"
#ifndef local
# define local static
#endif
#define Z_BUFSIZE (1024 * 4)
#define ALLOC(size) malloc(size)
#define TRYFREE(p) {if (p) free(p);}
#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
#define HEAD_CRC 0x02 /* bit 1 set: header CRC present */
#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
#define COMMENT 0x10 /* bit 4 set: file comment present */
#define RESERVED 0xE0 /* bits 5..7: reserved */
local int get_byte(gz_stream * s);
local int destroy(gz_stream * s);
local uLong getLong(gz_stream * s);
/* ===========================================================================
Opens a gzip (.gz) file for reading or writing. The mode parameter
is as in fopen ("rb" or "wb"). The file is given either by file descriptor
or path name (if fd == -1).
gz_open return NULL if the file could not be opened or if there was
insufficient memory to allocate the (de)compression state; errno
can be checked to distinguish the two cases (if errno is zero, the
zlib error is Z_MEM_ERROR).
*/
gz_stream *gz_open(HStream & _stream)
{
int err;
//int level = Z_DEFAULT_COMPRESSION; /* compression level */
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// char *p = (char*)mode;
//char fmode[80]; /* copy of mode, without the compression level */
//char *m = fmode;
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gz_stream *s;
s = (gz_stream *) ALLOC(sizeof(gz_stream));
if (!s)
return Z_NULL;
s->stream.zalloc = (alloc_func) 0;
s->stream.zfree = (free_func) 0;
s->stream.opaque = (voidpf) 0;
s->stream.next_in = s->inbuf = Z_NULL;
s->stream.next_out = s->outbuf = Z_NULL;
s->stream.avail_in = s->stream.avail_out = 0;
//s->_inputstream = NULL;
s->z_err = Z_OK;
s->z_eof = 0;
s->crc = crc32(0L, Z_NULL, 0);
s->msg = NULL;
s->transparent = 0;
s->mode = 'r';
//realking
err = inflateInit2(&(s->stream), -MAX_WBITS);
s->stream.next_in = s->inbuf = (Byte *) ALLOC(Z_BUFSIZE);
if (err != Z_OK || s->inbuf == Z_NULL)
{
return destroy(s), (gz_stream *) Z_NULL;
}
s->stream.avail_out = Z_BUFSIZE;
errno = 0;
s->_inputstream = &_stream;
return (gz_stream *) s;
}
/* ===========================================================================
Read a byte from a gz_stream; update next_in and avail_in. Return EOF
for end of file.
IN assertion: the stream s has been sucessfully opened for reading.
*/
local int get_byte(gz_stream * s)
{
if (s->z_eof)
return EOF;
if (s->stream.avail_in == 0)
{
errno = 0;
s->stream.avail_in = s->_inputstream->readBytes(s->inbuf, Z_BUFSIZE);
if (s->stream.avail_in == 0)
{
s->z_eof = 1;
return EOF;
}
s->stream.next_in = s->inbuf;
}
s->stream.avail_in--;
return *(s->stream.next_in)++;
}
/* ===========================================================================
* Cleanup then free the given gz_stream. Return a zlib error code.
* Try freeing in the reverse order of allocations.
*/
local int destroy(gz_stream * s)
{
int err = Z_OK;
if (!s)
return Z_STREAM_ERROR;
TRYFREE(s->msg);
if (s->stream.state != NULL)
{
err = inflateEnd(&(s->stream));
}
if (s->z_err < 0)
err = s->z_err;
TRYFREE(s->inbuf);
TRYFREE(s->outbuf);
TRYFREE(s);
return err;
}
// typedef unsigned char Byte
// typedef Byte FAR Bytef;
/* ===========================================================================
Reads the given number of uncompressed bytes from the compressed file.
gz_read returns the number of bytes actually read (0 for end of file).
*/
int gz_read(gz_stream * file, voidp buf, unsigned len)
{
//printf("@@ gz_read : len : %d\t",len);
gz_stream *s = (gz_stream *) file;
Bytef *start = (Bytef *) buf; /* starting point for crc computation */
Byte *next_out; /* == stream.next_out but not forced far (for MSDOS) */
if (s == NULL)
return Z_STREAM_ERROR;
if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO)
return -1;
if (s->z_err == Z_STREAM_END)
return 0; /* EOF */
s->stream.next_out = next_out = (Bytef *) buf;
s->stream.avail_out = len;
while (s->stream.avail_out != 0)
{
if (s->transparent)
{
/* Copy first the lookahead bytes: */
uInt n = s->stream.avail_in;
if (n > s->stream.avail_out)
n = s->stream.avail_out;
if (n > 0)
{
memcpy(s->stream.next_out, s->stream.next_in, n);
next_out += n;
s->stream.next_out = next_out;
s->stream.next_in += n;
s->stream.avail_out -= n;
s->stream.avail_in -= n;
}
if (s->stream.avail_out > 0)
{
s->stream.avail_out -=
s->_inputstream->readBytes(next_out, s->stream.avail_out);
}
return (int) (len - s->stream.avail_out);
}
if (s->stream.avail_in == 0 && !s->z_eof)
{
errno = 0;
s->stream.avail_in = s->_inputstream->readBytes(s->inbuf, Z_BUFSIZE);
if (s->stream.avail_in == 0)
{
s->z_eof = 1;
break;
}
s->stream.next_in = s->inbuf;
}
s->z_err = inflate(&(s->stream), Z_NO_FLUSH);
if (s->z_err == Z_STREAM_END)
{
/* Check CRC and original size */
s->crc = crc32(s->crc, start, (uInt) (s->stream.next_out - start));
start = s->stream.next_out;
if (getLong(s) != s->crc || getLong(s) != s->stream.total_out)
{
s->z_err = Z_DATA_ERROR;
}
else if (s->z_err == Z_OK)
{
inflateReset(&(s->stream));
s->crc = crc32(0L, Z_NULL, 0);
}
}
if (s->z_err != Z_OK || s->z_eof)
break;
}
s->crc = crc32(s->crc, start, (uInt) (s->stream.next_out - start));
return (int) (len - s->stream.avail_out);
}
/* ===========================================================================
Writes the given number of uncompressed bytes into the compressed file.
gzwrite returns the number of bytes actually written (0 in case of error).
*/
int gz_write(gz_stream * file, const voidp buf, unsigned len)
{
gz_stream *s = (gz_stream *) file;
if (s == NULL || s->mode != 'w')
return Z_STREAM_ERROR;
s->stream.next_in = (Bytef *) buf;
s->stream.avail_in = len;
while (s->stream.avail_in != 0)
{
if (s->stream.avail_out == 0)
{
s->stream.next_out = s->outbuf;
/*
if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
s->z_err = Z_ERRNO;
break;
}
*/
s->stream.avail_out = Z_BUFSIZE;
}
s->z_err = deflate(&(s->stream), Z_NO_FLUSH);
if (s->z_err != Z_OK)
break;
}
s->crc = crc32(s->crc, (Bytef *) buf, len);
return (int) (len - s->stream.avail_in);
}
/* ===========================================================================
Flushes all pending output into the compressed file. The parameter
flush is as in the deflate() function.
gz_flush should be called only when strictly necessary because it can
degrade compression.
*/
int gz_flush(gz_stream * file, int flush)
{
uInt len;
int done = 0;
gz_stream *s = (gz_stream *) file;
if (s == NULL || s->mode != 'w')
return Z_STREAM_ERROR;
s->stream.avail_in = 0; /* should be zero already anyway */
for (;;)
{
len = Z_BUFSIZE - s->stream.avail_out;
if (len != 0)
{
/*
if ((uInt)fwrite(s->outbuf, 1, len, s->file) != len) {
s->z_err = Z_ERRNO;
return Z_ERRNO;
}
*/
s->stream.next_out = s->outbuf;
s->stream.avail_out = Z_BUFSIZE;
}
if (done)
break;
s->z_err = deflate(&(s->stream), flush);
/* deflate has finished flushing only when it hasn't used up
* all the available space in the output buffer:
*/
done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);
if (s->z_err != Z_OK && s->z_err != Z_STREAM_END)
break;
}
return s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
}
/* ===========================================================================
Reads a long in LSB order from the given gz_stream. Sets
*/
local uLong getLong(gz_stream * s)
{
uLong x = (uLong) get_byte(s);
int c;
x += ((uLong) get_byte(s)) << 8;
x += ((uLong) get_byte(s)) << 16;
c = get_byte(s);
if (c == EOF)
s->z_err = Z_DATA_ERROR;
x += ((uLong) c) << 24;
return x;
}
/* ===========================================================================
Flushes all pending output if necessary, closes the compressed file
and deallocates all the (de)compression state.
*/
int gz_close(gz_stream * file)
{
// int err;
gz_stream *s = (gz_stream *) file;
if (s == NULL)
return Z_STREAM_ERROR;
#if 0
if (s->mode == 'w')
{
err = gz_flush(file, Z_FINISH);
if (err != Z_OK)
return destroy(s);
putLong(s->file, s->crc);
putLong(s->file, s->stream.total_in);
}
#endif
return destroy(s);
}
int gz_seek(gz_stream * , long , int )
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{
return -1;
}
long gz_tell(gz_stream * )
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{
return -1;
}